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A fuel atomizing nozzle for high-speed gas thermal spraying

A fuel atomization and thermal spraying technology, applied in coating, spraying device, melt spraying and other directions, can solve the problems of unsuitable high-speed flame spraying, complicated nozzle structure and high control requirements, and improve ignition reliability and combustion stability. high stability, compact structure, and the effect of improving uniformity

Active Publication Date: 2017-06-16
ACADEMY OF ARMORED FORCES ENG PLA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The external mixing nozzle mainly relies on the high-speed flowing gas and liquid flow to atomize under the impact of the nozzle outside. Usually, the nozzle of this structure also uses the mechanical structure to rotate the air flow and liquid flow to produce the centrifugal effect. Therefore, the nozzle The structure is complex and the size is large, so it is not suitable for high-velocity flame spraying
The internal mixing nozzle mainly relies on the high-speed kinetic energy of the gas to impact the fine liquid jet, and then sprays out after being fully mixed in the chamber, so as to realize the atomization of the liquid. The atomization effect of the nozzle with this structure is related to the speed of the gas and the pressure between the gas and the liquid. Poor and other factors are closely related, and the control requirements are relatively high, so it is difficult to apply in the air-assisted high-speed flame spraying technology

Method used

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  • A fuel atomizing nozzle for high-speed gas thermal spraying
  • A fuel atomizing nozzle for high-speed gas thermal spraying
  • A fuel atomizing nozzle for high-speed gas thermal spraying

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 and figure 2 As shown, the nozzle embodiment 1 of the present invention includes a main cavity 2, the outer wall of the main cavity 2 is equipped with a sub-cavity 15, the inlet end of the main cavity 2 is provided with a gas inlet 1 and the outlet end is provided with an inner wall connected to the outside. cavity, the center of the inner cavity is equipped with a cone-like body 9, the cone head 91 of the cone-like body 9 is placed in the opening formed by the inner cavity on the outlet end of the main cavity body 2 and the cone tail 92 is located inside the main cavity body 2, the cone-like body Between the outer wall of 9 and the inner wall of the inner cavity, an annular main chamber 6 that gradually expands to the periphery in a trumpet shape from the inside to the outside is formed, and an annular main spout 8 is formed between the opening at the outlet end of the main cavity 2 and the opening. In order to realize the oblique injection of the mi...

Embodiment 2

[0027] Such as image 3 and Figure 4 As shown, the nozzle embodiment 2 of the present invention includes a main cavity 21, the outer wall of the main cavity 21 is equipped with a sub-cavity 28, the inlet end of the main cavity 21 is provided with a gas inlet 22 and the outlet end is provided with an inner wall that communicates with the outside. cavity, the center of the inner cavity is equipped with a cone-like body 27, the cone head 271 of the cone-like body 27 is placed at the opening formed by the inner cavity on the outlet end of the main cavity body 21 and the cone tail 272 is located inside the main cavity body 21, the cone-like body Between the outer wall of 27 and the inner wall of the inner cavity, a ring-shaped main chamber 24 gradually expanding from the inside to the outside in a trumpet shape to the periphery is formed, and an annular main spout 26 is formed between the opening of the outlet end of the main cavity 21 and the opening. In order to realize the obl...

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Abstract

The invention discloses a fuel atomizing nozzle for high-speed gas thermal spraying. There is a cone-like body, a ring-shaped main chamber that gradually expands to the periphery in a trumpet shape from the inside to the outside is formed between the cone-like outer wall and the inner wall of the inner cavity, and an annular main nozzle is formed at the opening of the outlet end of the main cavity, and the gas inlet passes through The gas delivery channel communicates with the end of the main chamber located inside the main cavity, and an oil injection hole is opened on the auxiliary cavity, which communicates with the middle of the main chamber through the oil delivery channel, and the secondary air flow is provided on the auxiliary cavity. Ring-shaped auxiliary chamber, the auxiliary chamber communicates with the outside through the annular auxiliary nozzle, and the auxiliary nozzle is located on the outer peripheral side of the main nozzle, so that the secondary airflow ejected from the auxiliary nozzle and the mixed airflow ejected from the main nozzle meet at a set angle. hit. The invention relies on gas power to atomize the fuel, and can realize the effects of uniform mixing and atomization of gas and fuel and stable combustion.

Description

technical field [0001] The invention relates to a fuel atomizing nozzle for high-speed gas thermal spraying, which belongs to the technical field of fuel atomizing combustion. Background technique [0002] The thermal spray technology based on the combustion of liquid fuel to generate high-velocity gas can be used for the preparation of metal or non-metallic coatings. This technology usually includes two types: oxygen-assisted combustion high-velocity flame spraying and air-assisted combustion high-velocity flame spraying. The common feature is that liquid fuels such as kerosene Atomization occurs, and at the same time it is mixed with oxygen or air to generate a combustible mixture, which is ignited and burned under the action of an external heat source to generate high-temperature and high-speed gas, which heats and accelerates the deposition of the material to be sprayed to form a coating. [0003] Oxygen-assisted combustion kerosene high-velocity flame spraying technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129B05B17/04
Inventor 陈永雄梁秀兵徐滨士胡尧强张志彬
Owner ACADEMY OF ARMORED FORCES ENG PLA